Abstract: A capacitance multiplier circuit for a filter is provided. The capacitance multiplier circuit capable of adjusting its equivalent capacitance and used in the filter, applied to a Phase Locked Loops (PLLs) circuit, includes a first operational amplifier having a positive input end for receiving an input signal, an output end, and a negative input end connected to the output end, a second operational amplifier having a positive input end, a negative input end connected to the output end of the first operational amplifier through a first resistor, and an output end connected to the negative input end through a second resistor, and a capacitor connected between the positive input end of the first operational amplifier and the output end of the second operational amplifier. An equivalent capacitance of the capacitance multiplier circuit is adjusted by configuring the ratio of the first resistor and the second resistor.

Abstract: An electrical connector bracket (50) comprises a base plate (51), a first sidewall (52) and a second sidewall (53) connecting the first sidewall (52) extending upwardly from two pairs of lateral sides of the base plate (51), a transverse inner wall (54) and a lengthwise inner wall (55) perpendicular to the transverse inner-wall (54) extending from inner base plate (51). The first sidewall (52) and the second sidewall (53) form cooperatively a closed section. The transverse inner wall (54) and the lengthwise inner wall (55) divide the closed section into several small rectangular carrying sections, and each rectangular carrying section can receive an electrical connector therein. In each rectangular carrying section, each second sidewall of the carrying portion defines an opening adjacent to the lengthwise inner wall (55).

Abstract: An electrical contact (1) used in a socket includes a base portion (11), a solder portion (12) bending front a bottom edge of the base portion, a vertical head (13) and a spring ann (14) extending from a top edge of the base portion and a contact portion (15) formed at a topmost end of the spring arm. The head and the spring arm extending upwardly from two opposite sides of the top edge of the base portion. A relatively large spacing (16) is defined between the head and the spring arm. The spring arm includes a body section (140) connecting with the base portion and a stretching section (142) adjacent the contact portion. This configuration makes the contact be more easily manufactured, thereby manufacturing casts is reduced.

Abstract: A land grid array (LGA) connector (1) according to an embodiment of the present invention includes an insulative housing (2), a stiffener (3) coupled to the housing, and a plurality of ribs (23) projecting from a periphery edge of the housing. The stiffener defines an opening (31) for surrounding the housing. Each of the ribs has a base defining a mating surface (2321) and a mounting surface (2312). The stiffener is coupled to the housing by the rib mating surface abutting against a wall face (32) of the stiffener opening, and the rib mounting surface resting on a peripheral edge (320) of the stiffener that defines the opening. As such, a reliable coupling between the stiffener and the housing is achieved, thereby having no possibility of releasing the housing from the stiffener by an external, improper force.

Abstract: Disclosed is a BGA connector assembly including an insulative housing (11) with a plurality of terminals (15) in electrical connection with corresponding solder balls (3) that extend from a surface of the housing. The solder balls form a soldering region (30) for attachment to a printed circuit board. The whole electrical connector assembly has a center of gravity biased from a center of the soldering region, and at least one recess (111) is formed in the housing. The at least one recess prevents the connector assembly from becoming inclined with respect to the printed circuit board when the solder balls are attached to the printed circuit board.

Abstract: Disclosed is a LGA socket connector including an insulative housing (2), a stiffener (3), a clip (4), and a lever (5) defining thereof a driving portion (50) and a locking portion (52) linked thereto. The stiffener is configured to grasp a periphery of the housing. The clip and the locking portion of the lever are essentially pivotally moved about longitudinal ends of the housing respectively, but with the driving portion disposed adjacent one transverse side of the housing. At least one of the clip and the stiffener is provided with a recessed region (300) adjacent said transverse side of the housing, thereby preventing the whole connector from becoming inclined when the connector is horizontally locked and placed on the printed circuit board.

Abstract: Disclosed is a BGA connector assembly including an insulative housing (11) with a plurality of terminals (15) in electrical connection with corresponding solder balls (3) that extend from a surface of the housing. The solder balls form a soldering region (30) for attachment to a printed circuit board. The whole electrical connector assembly has a center of gravity biased from a center of the soldering region, and at least one recess (111) is formed in the housing. The at least one recess prevents the connector assembly from becoming inclined with respect to the printed circuit board when the solder balls are attached to the printed circuit board.

Abstract: Disclosed is a LGA socket connector including an insulative housing (2), a stiffener (3), a clip (4), and a lever (5) defining thereof a driving portion (50) and a locking portion (52) linked thereto. The stiffener is configured to grasp a periphery of the housing. The clip and the locking portion of the lever are essentially pivotally moved about longitudinal ends of the housing respectively, but with the driving portion disposed adjacent one transverse side of the housing. At least one of the clip and the stiffener is provided with a recessed region (300) adjacent said transverse side of the housing, thereby preventing the whole connector from becoming inclined when the connector is horizontally locked and placed on the printed circuit board.

Abstract: An electrical contact (1) used in a socket includes a base portion (11), a solder portion (12) bending from a bottom edge of the base portion, a vertical head (13) and a spring arm (14) extending from a top edge of the base portion and a contact portion (15) formed at a topmost end of the spring arm. The head and the spring arm extending upwardly from two opposite sides of the top edge of the base portion. A relatively large spacing (16) is defined between the shoulder and the spring arm. The spring arm includes a body section (140) connecting with the base portion and a stretching section (142) adjacent the contact portion. This configuration makes the contact be more easily manufactured, thereby manufacturing costs is reduced.

Abstract: A built-in-self-test circuit for phase locked loops-jitter testing and the method thereof are used to solve the problems of difficult processing and test of high frequency signals encountered during test of jitter signal of phase locked loops. The built-in-self-test circuit for phase locked loops-jitter testing comprises a phase locked loop unit electrically connected with a frequency divide unit. The frequency divide unit is electrically connected with a signal conversion unit. A signal computation unit is electrically connected with the signal conversion unit. After an input signal is provided to and processed by the phase locked loop unit, the signal conversion unit outputs a self test output signal exhibiting the occurrence situation of jitter signal of the phase locked loop unit. High frequency signals encountered during test of jitter signal of phase locked loops can therefore be reduced.

Abstract: A built-in-self-testing (BIST) circuit with digital output for phase locked loops-jitter testing and the method thereof are used to solve the problems of difficult processing and test of high frequency signals encountered during test of jitter signal of phase locked loops. The built-in-self-testing (BIST) circuit with digital output for phase locked loops-jitter testing comprises a phase locked loop unit electrically connected with a frequency divide unit. The frequency divide unit is electrically connected with a signal conversion unit. A digital computation unit is electrically connected with the signal conversion unit. A maximum hold circuit is electrically connected with the digital computation unit. After an input signal is provided to and processed by the phase locked loop unit, the maximum hold circuit outputs a self test output signal exhibiting the occurrence situation of jitter signal of the phase locked loop unit.

Abstract: Method and related apparatus for realizing frequency-multiplication by generating a high frequency signal according to a plurality of low frequency signals. The method includes: according to a plurality output signals generated by a phase-locked loop (PLL) or a delay-locked loop (DLL), generating a plurality of reference signals with a same frequency and different phases; when a number of the reference signals with signal level high is greater than a number of the reference signals with signal level low, making a signal level of the output signal remains a first level; otherwise, making the signal level of the output signal remains a second level substantially different from the first level. Thus the frequency of the output signals is a multiplication of the frequency of the input signals.

Abstract: Method and related apparatus for realizing frequency-multiplication by generating a high frequency signal according to a plurality of low frequency signals. The method includes: according to a plurality output signals generated by a phase-locked loop (PLL) or a delay-locked loop (DLL), generating a plurality of reference signals with a same frequency and different phases; when a number of the reference signals with signal level high is greater than a number of the reference signals with signal level low, making a signal level of the output signal remains a first level; otherwise, making the signal level of the output signal remains a second level substantially different from the first level. Thus the frequency of the output signals is a multiplication of the frequency of the input signals.

Abstract: A bicycle derailleur gearshift position indicator includes a housing holding a gearshift position indication member, the gearshift position indication member having indication plates corresponding to the gearshift positions of the derailleur system of the bicycle and a view window through which the bicycle rider views the indication of the gearshift position indication member, and a cable take-up wheel suspended below the housing and rotated with the shifters of the derailleur system to move the indication plates of the gearshift position indication member.

Abstract: A linearly-displacing dual dial rods speed changing controller comprises a base, a wire hub seat, an advancing member, and a withdrawing member. The wire hub seat is fastened with a guide wire of a speed changer. The wire hub seat is controlled by dial rods of the advancing member and the withdrawing member to displace linearly in a reciprocating manner on the guide rail of the base, thereby actuating the guide wire to bring about a pulling action to attain the speed change.

Abstract: A linearly-displacing dual dial rods speed changing controller comprises a base, a wire hub seat, an advancing member, and a withdrawing member. The wire hub seat is fastened with a guide wire of a speed changer. The wire hub seat is controlled by dial rods of the advancing member and the withdrawing member to displace linearly in a reciprocating manner on the guide rail of the base, thereby actuating the guide wire to bring about a pulling action to attain the speed change.

Abstract: A bicycle derailleur gearshift position indicator includes a housing holding a gearshift position indication member, the gearshift position indication member having indication plates corresponding to the gearshift positions of the derailleur system of the bicycle and a view window through which the bicycle rider views the indication of the gearshift position indication member, and a cable take-up wheel suspended below the housing and rotated with the shifters of the derailleur system to move the indication plates of the gearshift position indication member.

Abstract: A dual dial rod speed changing indicator comprises a base board, a wire hub seat, an advancing member, and a withdrawing member. The wire hub seat is acted on by a bias force and pivoted to the base board. The wire hub seat has a first ratchet tooth portion and a second ratchet tooth portion. The advancing member comprises an advancing dial rod and an advancing ratchet pawl pivoted to the dial rod. The advancing dial rod is pivoted to the base board such that the advancing dial rod meshes with the first tooth portion at the time when the advancing dial rod is exerted on by an external force, thereby actuating the wire hub seat to turn and advance. The withdrawing member comprises a locating ratchet pawl and a withdrawing dial rod, which are pivoted with the base board. The withdrawing dial rod has a locating tooth which meshes with the second tooth portion to locate the wire hub seat at the time when the withdrawing dial rod turns on the base board.

Abstract: An IC card connector comprises an insulative housing and a plurality of contacts. A plurality of passageways is defined through the insulative housing for receiving the corresponding contacts therein. Each contact comprises a first contacting arm, a second contacting arm and a retaining portion connected between the first and second contacting arms. The first contacting arm comprises a first arcuate portion for electrically a contacting corresponding circuit of an IC card and a first connecting portion connected between the first arcuate portion and the retaining portion. The second contacting arm comprises a second arcuate portion, a soldering portion downwardly extending from the second arcuate portion, a second connecting portion extending from the retaining portion to the soldering portion, and a pair of fixing portions extending from lateral edges of the second connecting portion.